Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 334 AM EST Fri Dec 30 2016 Valid 12Z Fri Dec 30 2016 - 12Z Sun Jan 01 2017 ...Heavy snow over Maine wind down on Friday morning... ...Heavy rain possible over the Central Gulf Coast... ...Temperatures will be 10 to 20 degrees above average across the Northern/Central Plains... A front over the Northern High Plains to parts of the Pacific Northwest will move eastward to the Great Lakes and southward to the Southern Plains/Southern California by Saturday evening. The system will produce snow over parts of the interior Pacific Northwest to the Northern Rockies with rain along the Pacific Northwest Coast on Friday morning. The snow will move into the Upper Mississippi Valley/Upper Great Lakes by Friday evening and into parts of the Northeast by Saturday evening. Rain will develop along the front over parts of the Lower Mississippi Valley/Southern Plains overnight Friday and move eastward to Ohio/Tennessee Valleys/Central Gulf Coast by Saturday evening. Snow over parts of the Great Basin/Northern California will end by Saturday morning. An upper-level low just off the Southern California Coast will move inland to the Southern High Plains while weakening by Saturday. The system will produce rain over parts of Southern California that will move eastward to the Southern Rockies/Southern High Plains by Saturday. Snow will develop over parts of the higher elevations of the Great Basin that will move into parts of the higher elevations of the Southern Rockies/Southern High Plains by Saturday evening. A second upper-level low will develop over Northern California overnight Friday moving southward to Southern California by Saturday evening. The storm will produce rain over parts of Central/Southern California with snow over the higher elevations over the Sierras on Saturday. In addition on Saturday afternoon into evening, another front will move into parts of the Pacific Northwest. The system will produce rain and higher elevation snow over parts of the Northwest by Saturday evening. Meanwhile, deep low pressure center over Maine will move northward into Eastern Canada by Friday evening. Heavy snow over Maine will wind down by late Friday morning. Circulation around the low will aid in bringing cold air over the Great Lakes that will produce lake effect/enhanced snow downwind from the Great Lakes and into the higher elevations of the Central/Northern Appalachians on Friday. The snow will come to an end west to east by Friday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php